Table 2

Predictors of change in pain intensity at three months (R² = 0.46) and 12 months (R² = 0.47): results of the multiple linear regression analyses

	3 Months (n = 157)				12 Months (n = 151)
	n	b*	95% CI	p Value	n	b*	95% CI	p Value
*b positive: favourable change in pain intensity since baseline per unit of the independent predictor; b negative: unfavourable change in pain intensity since baseline per unit of the independent predictor.
†Higher score means less social support.
b, regression coefficient; CI, confidence interval.
Demographic factors
Female (v male)	107	−0.94	(−1.57 to −0.31)	0.00
older age (per year)	157	−0.03	(−0.06 to −0.01)	0.01
Baseline score
More severe pain (per point increase)	157	0.56	(0.42 to 0.71)	0.00	151	0.62	(0.45 to 0.79)	0.00
Characteristics of complaint
Duration of current episode:
<1 week	8	0.00			7	0.00
1 week to 1 month	44	−1.45	(−2.92 to 0.02)	0.05	42	−1.63	(−3.35 to 0.09)	0.06
1 month to 6 months	66	−1.76	(−3.21 to −0.30)	0.02	64	−1.63	(−3.32 to 0.05)	0.06
>6 months	36	−2.19	(−3.70 to −0.68)	0.00	36	−2.36	(−4.14 to −0.59)	0.01
History of complaints (v no history)					83	−1.50	(−2.27 to −0.74)	0.00
Complaint at dominant side (v other side)	86	0.82	(0.22 to 1.41)	0.01
Tendency to massage hands (v no tendency)					66	−0.88	(−1.55 to −0.21)	0.01
Comorbidity
No musculoskeletal comorbidity (v comorbidity)	63	0.55	(−0.09 to 1.19)	0.09
Multiple musculoskeletal complaints (v “no”)	24	−0.98	(−1.83 to −0.12)	0.03	25	−1.23	(−2.14 to −0.31)	0.01
Psychosocial factors
Coping: more retreating (per point increase)	155	−0.09	(−0.17 to −0.01)	0.03	150	−0.10	(−0.20 to −0.01)	0.04
Coping: more worrying (per point increase)					150	−0.10	(−0.18 to −0.02)	0.01
More fear voidance (per point increase)	156	0.02	(0.00 to 0.04)	0.05
Social support†
low	51	0.00
medium	69	−0.70	(−1.37 to −0.02)	0.04
high	35	−1.09	(−1.92 to −0.27)	0.01